Thermoplastic resin blend of polysulfone resin and an ethylenepropylene terpolymer or graft derivative thereof

ABSTRACT

BLENDS OF THERMOPLASTIC POLYSULFONE RESIN AND ETHYLENEPROPYLENE TERPOLYMERS AND GRAFT DERIVATIVES THEREOF ARE CHARACTERIZED BY AN UNUSUALLY USEFUL COMBINATION OF PROPERTIES, PARTICULARLY LOW TEMPERATURE MELT PORCESSABILITY IN COMBINATION WITH HIGH IMPACT STRENGTH AND FLEXURAL STRENGTH.

United States Patent 3,641,207 THERMOPLASTIC RESIN BLEND OF POLY- SULFONE RESIN AND AN ETHYLENE- PROPYLENE TERPOLYMER OR GRAFT DERIVATIVE THEREOF Robert L. Lauchlan, Granger, Ind., assignor to Uniroyal, Inc., New York, N.Y. No Drawing. Filed July 15, 1969, Ser. No. 842,009 Int. Cl. C08f 29/12, 41/12 US. Cl. 260-876 R 10 Claims ABSTRACT OF THE DISCLOSURE Blends of thermoplastic polysulfone resin and ethylenepropylene terpolymers and graft derivatives thereof are characterized by an unusually useful combination of properties, particularly low temperature melt processability in combination with high impact strength and flexural strength.

FIELD OF THE INVENTION This invention relates to blends of synthetic polymer compositions. More particularly, the invention relates to the blend which results from the physical admixing of a polysulfone resin with an ethylene propylene terpolymer or graft derivatives from said terpolymer.

SUMMARY OF THE INVENTION There is a need for reasonably priced plastic compounds possessing the following properties: toughness, good mechanical strength, resistance to high temperatures, good melt processability and high impact strength over a wide range of temperatures. The present invention provides such a plastic compound, in the form of a blend of from 99% to 75% (all percentages are expressed by weight herein) of a thermoplastic polysulfone and correspondingly from 1% to of a terpolymer or graft derivative thereof. The resulting blends exhibit thermoplastic properties including good melt processability and impact resistance without sacrificing the desirable heat distortion temperature and fiexural strength of the unmodified polysulfone resin.

DESCRIPTION OF PREFERRED EMBODIMENTS The matrix or predominate portion of the polyblend of the invention may be described as a linear, thermoplastic polyarylene polyether polysulfone, wherein the arylene units are interspersed with ether and sulfone linkages. These resins may be obtained by reaction of an alkali metal double salt of a dihydric phenol and a dihalobenzenoid compound, either or both of which contain a sulfone linkage SO between arylene groupings, to provide sulfone units in the polymer chain in addition to arylene units and other units. The polysulfone polymer has a basic structure composed of recurring units of the formula -OEOE- wherein E is the residuum of the dihydric phenol and E is the residuum of the benzenoid compound having an inert electron withdrawing group in at least one of the positions ortho and para to the valence bonds; both of said residua are valently bonded to the ether oxygens through 3,641,207 Patented Feb. 8, 1972 as defined therein, with the further limitation that either E or E must be so selected, from the values of E and E disclosed in said patent, as to contain a sulfone linkage to provide sulfone units in the final polymer chain. Thus, if E is so selected as not to contain the sulfone linkage, then E must be selected from one of the forms containing sulfone linkage; if E is so selected as not to contain a sulfone linkage, then B must be selected from one of the forms containing a sulfone linkage. Of course, E and E may both contain sulfone linkages if desired. Typical preferred polymers are composed of recurring units having the formula as described in the Robinson et a1. patent, with the further proviso that at least one of R and R must be -SO In the foregoing formula Y and Y can be the same or different inert substituent groups as alkyl groups having from 1 to 4 carbon atoms, halogen atoms (i.e., fluorine, chlorine, bromine or iodine) or alkoxy radicals having from 1 to 4 carbon atoms, r and z are integers having a value of from 0 to 4, inclusive. Typically R is representative of a bond between aromatic carbon atoms or a divalent connecting radical and R represents sulfone. Preferably R represents a bond between aromatic carbon atoms. Even more preferred are the thermoplastic polyarylene polysulfones of the above formula wherein r and z are zero, R is a divalent connecting radical of the formula wherein R" represents, as exemplified in Robinson et al., a member of the group consisting of alkyl, lower aryl, and the halogen substituted groups thereof, and R is a sulfone group.

Typical examples are the reaction products prepared residue) with 4,4'-dichlorodiphenylsulfone (source of E residue) and equivalent reaction products such as those from 4,4-dichlorodiphenylsulfone with bisphenol of benzophenone, or the bisphenol of acetophenone, or the hisphenol of vinyl cyclohexane, or 4,4'-dihydroxydiphenyl sulfone (see Examples 1, 3, 4, 5 and 7 of Robinson et al.).

Further useful discussion of the polysulfone resins which may be used is to be found in British Pat. 1,060,546, referred to above. Ordinarily at least about 10% and preferably at least about of the linkages between the arylene groups are sulfone groups.

Apart from the ether and sulfone linkages, arylene groups may be bonded directly to each other or may be separated by inert groups, e.g., alkylidene groups such as isopropylidene groups, which latter appear in the chain when bisphenol A is used in the preparation of the polysulfone.

The additive terpolymers or graft polymers constitute between 1% and of the blend nad preferably between 5% and 20% of the blend. The latter range is preferred because within these limits the processability of the blend is optimized. The polymers which are blended with the polysulfone resin matrix are (a) the ethylenepropylene non-conjugated diene terpolymers (EPDM) and/or (b) graft additives thereof.

The non-conjugated dienes used in the preparation of the terpolymer elastomers may include open chain nonconjugated dienes such as 1,4-hexadiene and also cyclic (especially bridged ring) non-conjugated dienes such as dicyclopentadiene, S-methylene 2-norbornene, 5-ethylidene 2-norbornene and 1,4-cyclooctadiene. The respective weight ratio ethylene to propylene in the elastomers may range from 40/60 to 75/25. The content of additional monomers, such as the non-conjugated diene, in the terpolymer may range from about 1% to about 20% by weight.

Suitable terpolymers rubbers are described for example in British Pat. 886,368, to United States Rubber Company Dec. 31, 1965 and British Pat. 1,107,936. For optimum solubility it is preferred that the elastomer have a 212 F. Mooney viscosity of less than 75 (ML-4) although higher molecular weight elastomers may be used.

' Some specific examples of suitable rubber polymers are polymers made from ethylene-propylene-dicyclopentadiene (a preferred species in the present invention), ethylene-propylene-1,4-hexadiene, ethylene-propylene-methylene norbornene, ethylene-propylene-cyclooctadiene, ethylene-propylene-tetrahydroindene and ethylene-propylene-S- ethylidene-Z-norbornene.

All of the above noted elastomer polymers can be made by'solution polymerization which polymerization uses a coordination catalyst prepared by mixing a vanadium compound, (e.g. V001 with an alkylaluminum halide (e.g. ethylaluminum sesquichloride).

The graft terpolymers used in the present invention are made by graft copolymerizing on the terpolymer spines disclosed herein one or more resin-forming monomers such as those having the general formula:

4 wherein R and R each represent a substituent selected from the group consisting of hydrogen, halogen, an alkyl group having 1 to 4 carbon atoms, carboalkoxy, or R and R compositely represent an anhydride linkage and R is hydrogen, vinyl, an alkyl or alkenyl, cycloalkyl, carboalkoxy, alkoxy alkyl, alkyl carboxy, aralkyl ketoxy, aryl, all of which do not contain more than 12 carbon atoms, although in the case of an alkyl group only 1 carbon need be present, halogen, carboxy, cyano, or pyridyl group and n is an integer between 0 and 9. Preferred monomers to be grafted are styrene, methyl methacrylate or combinations thereof such as styreneacrylonitrile, etc. Other useful monomers are alpha methyl styrene, methacrylonitrile and ethyl acrylate. In the final graft copolymer the resinous portion and the rubbery portion are believed to be in large part chemically combined.

In some cases the grafted EPDM polymer is blended with additional separately prepared resins using the monomers disclosed in the graft polymerization method noted above.

The object of this invention is to modify a polysulfone resin with the terpolymer or graft derivatives from said terpolymer so that when comparing the blend with an unmodified polysulfone, the desirable heat distortion temperature and modulus of elasticity of unmodified polysulfone is substantially retained while the impact strength is increased.

The modulus of elasticity as determined by ASTM method D790-66 is a measure of the stiffness or rigidity of a material. In general thermoplastics deform permanently When heavy loads are applied, and therefore a plastic with high modulus is preferred. Modulus decreases With an increase in temperature, and above the heat distortion temperature the modulus drops sharply.

The impact strength of a plastic as determined by ASTM method D256-56 method A, is a measure of its toughness in terms of its resistance to breakage under conditions of high velocity of an impacting object. The impact strength values are of practical importance since they provide quantitative differentiation of materials in terms of their resistance to fracture. In the present invention there is a slight sacrifice of modulus but this is negligible, when compared with the increase in impact strength. Of great importance in the present invention is the capability of providing a proper balance of properties in the blend to suit individual requirements or uses.

It is obvious that the additive polymers used in accordance with the present invention possess a spectrum of moduli. Thus the properties of said additive polymers will range from rubbery to resinous, and the polysulfone properties will be modified accordingly.

To prepare the belnd of the invention, the polysulfone and the terpolymer or graft derivative thereof may be mechanically blended together in the desired proportions with the aid of any suitable mixing device conventionally used for mixing rubbers or plastics, such as a differential roll mill, Banbury or other internal mixer or an extruder. An internal shear mixer such as a Banbury mixer is preferred because of its ease of operation. In order to facilitate thorough mixing of the polymers and to develop the desired improved combination of physical properties, the mechanical blending is carried out at sufiiciently high temperatures to soften the polymers so that they are thoroughly dispersed and intermingled With each other. As the polysulfone has the higher softening point, this temperature will govern the mixing temperature selected. Mixing is continued until a uniform blend is obtained.

Alternatively the polysulfone and terpolymer or graft derivative of said terpolymer may be solution blended by dissolving the polymers in a suitable solvent, and subse quently precipitating the polymer blend by adding the solution into a miscible non-solvent to produce a homogeneous blend which is then dried.

The following examples illustrate the invention in greater detail and specifically show that upon the introduction of the terpolymer or graft derivative of said terpolymer into the polysulfone, the proportionate increase in the impact strength of the polyblend is significantly greater than the proportionatedecrease in modulus of said polyblend.

EXAMPLE 1 This example illustrates the impact improvement achieved by incorporatinginto polysulfone resin various levels of an ethylene-propylene-dicyclopentadiene terpolymer manufactured by Uniroyal, Inc. The terpolymer is characterized by an ML-4 viscosity of 60 at 212 F, an iodine number of 10 and a weight percent propylene of 32.

The terpolymer in each instance was blended into the polysulfone resin in a Banbury above the fluxing temperature of 410 F. The polyblends were subsequently milled and calendered at 430 F. and the resulting sheets laminatedto form plaques A" x 8" x 8") in a press at 450 F. under 20 tons load.

The comparative data is set forth in Table 1.

EXAMPLE 3 TABLE 3.OOMPARISON OF RESIN AND POLYBLEND PROPERTIES 90% poly- 100% snlfone, 1181 1, polysulione EPD M notched Izod (ft.-lbs./in.) 0. 8 8.1 Percent increase in impact strength over base resin 913 Flexural modulus (p,s.i. 10 3. 73 2. 98 Percent decrease in flexural modulus 0 er base resin 20 Heat distortion temperature C F., 264 333 Rockwell harness 120 114 l EPDM represents ethylene-propylene-M-hexadiene.

TABLE 1;COMPARISON OF RESIN AND POLYBLEND PROPERTIES EPDM represents ethylene-propylene-dicyclopentadiene terpolymer.

As shown in' Table 1, the proportionate increase in the l+.73 F. notched Izod impact value is greater than the proportionate decrease in modulus for each of the polyblends listed. The heat distortion temperature of the polyblend is relatively unchanged.

EXAMPLE 2 This example illustrates the impact improvement achieved by incorporating into polysulfone resin of an ethylene-propylene 5 ethylidene 2 norborene terpolymer manufactured by Uniroyal, Inc. The terpolymer is characterized by an ML-4 viscosity of 60 at 212 R, an iodine number of 10 and a weight percent propylene of 42. The terpolymer was blended into the polysulfone resin in a Banbury mixer above the fluxing temperature of 410 F. The polyblends were subsequently milled and calendered at 440 F. and the resulting sheets laminated to form plaques 0A" x 8" x 8") in a press at 450 F. under tons load.

The comparative data is set forth in Table 2.

TABLE 2.COMPARISON OF RESIN AND POLYBLEND 1 EPDM represents ethylene-propylene-5-ethylidene-2-norbornene.

As shown in Table 2, the proportionate increase in the H-73 F. notched Izod impact value is greater than the proportionate decrease in modulus for the polyblend.

As shown in Table 3, the proportionate increase in the +73 F. notched Izod impact value is greater than the proportionate decrease in modulus for the polyblend.

EXAMPLE 4 This example illustrates the impact improvement achieved by incorporating into polysulfone resin 10% of an ethylene-propylene-1,4-hexadiene terpolymer manufactured by El. du Pont de Nemours. The terpolymer is characterized by an ML-4 viscosity of 40 at 212 F. The terpolymer was blended into the polysulfone resin in a Banbury mixer above the fluxing temperature of 410 F. The polyblends were subsequently milled and calendered at 440 F. and the resulting sheets laminated to form plaques x 8" x 8") in a press at 450 F. under 20 tons load.

1 EPDM represents ethylene-propylene-l i-hexadiene. As shown in Table 4, the proportionate increase in the +73 F. notched Izod impact value is greater than the proportionate decrease in modulus for the polyblend.

EXAMPLE 5 This example illustrates the impact improvement achieved by incorporation into polysulfone resin 10% of an ethylene-propylene-5-ethylidene-2-norbornene terpolymer manufactured by Uniroyal Inc. The terpolymer is characterized by an ML-'-4 viscosity of 90 at 212 F., an iodine number of 10 and a Weight percent propylene of 40. The terpolyrner was blended into the polysulfone resin in a Banbury mixer above the fluxing temperature of 410 F. The polyblends were subsequently milled and calendered at 440 F. and the resulting sheets laminatedto form plaques /i" x 8" x 8") in a press at 450 F. under 20 tons load. a

The comparative data is set forth in Table 5.

TABLE 6 -COMPARISON F RESIN AND POLYBLEND PROPERTIES 90% poly- 100% sulione, 10% polysulfone EPDM 1 34 notched Izod (ft.-lbs./ln.).-.. 0. 8 5. 3 Percent increase in impact strength over base resin 563 Flexural modulus (p.s,i.X10 3. 73 2. 82 Percent decrease in flexural modulus over base resin 24 Heat distortion tempesature F., 264 p.s.i.)- 341 p 327 Rockwell hardness v120 113 1 EPDM represents ethylene-propylene-5-ethylidene-2-norbornene. As shown in Table 5 the proportionate increase inthe +73 F. notched Izod impact value is greater than the proportionate decrease in modulus for the polyblend. I

EXAMPLE 6 ing to the method described in copending application Ser. No. 787,894, filed December 30, 1968.

The graft copolymer was blended into the polysulfone resin at 480 F. on a differential roll mill, calendered at 450 F. and subsequently molded into plaques using the method described in Example 1.

The data set forth in Table 6 is a comparison 'of'the unmodified polysulfone resin with the polysulfone resin blended with the graft copolymer described'in this'example.

The graft copolymer used herein was prepared according to the method described in copending application Ser. No. 787,984, filed Dec. 30, 1968.

The graft copolymer was blended into the polysulfone resin at 480 F. on a differential roll mill, calendered at 450 F. and subsequently molded into plaques using the method described in Example 1.

The data set forth in Table 7 is a comparison of the unmodified polysulfone resin with the polysulfone resin blended with the graft copolymer described in this example.

TABLE 7.COMPARIS(1gN OF RESIN AND POLYBLEN ROPERIIES p 95% 90% n polysulfone, polysulfone, 100% 5% S/AN 10% S/AN I, polysulfone on EPDM l on EPDM notch I zod impact strength (ft.-lbs./in.)+73 F 0. 8 v 1. 9 3. 4 Percent increase in impact strength over base resin 137 325 Flexural modulus 373, 000 .340, 000 292, 000 Percent decrease in fiexural modulus over base resin 8. 9 21. 7 Heat distortion temp. F., 264 psi.) 341 339 333 Rockwell hardness 122 112 EXAMPLE s -This example illustrates the degree of improvement in impact strength achieved by incorporating into polysulfone resin (coded P-1700 and sold by Union' Carbide Co.) various levels of a graft copolymer consisting of 28% styrene, 12% acrylonitrile and 60% ethylene-propylene-S-ethylidene-Z-norbornene terpolyrner spine, said percentages being based on the total weight of graft copolymer. I

The terpolyrner spine has a propylene content of 37%, based uponthetotal weight of the terpolyrner and an iodine number of 9. i

The graft copolymer'was blended into the polysulfone resin "at 480 F. on adifferential roll' mill, calendered at 450 F. and subsequently molded into plaques using the method described in Example 1.

The data set forth in Table 8 is a comparison of the fiinmodifie'd polysulfone resin with the polysulfone resin blended with the'graft copolymer described in this example.

TABLE 6.COMIARISON 0F RESIN AND POLYBLEND 9 TABLE ,8.COMPARISON OF RESIN AND POLYBLEND PROPERTIES p i I v I PROPERTIES v l i 95% 9 I 95% 90% V polysulfone, polysulfone, polysulfone, polysulfone, 5% S/AN 10% S/AN 100% 5% S/AN 10% S/AN polysulfone on EPDM 1 on EPDM 1 polysulfone EPDM l on-EPDM l notch Izod im act *4 notch Izod impact strength (it-lbs. 1n.)+73 F. 0. 8 4. 3 10.7 strength (it.-lbs./in.) +73 F. 0. 8 7. 4 2. 7 Percent increase in impact Percent increase in impact strength over base resin 38 37 strength over base resin 825 238 Flexural modulus 373, 000 334, 000 298, 0 Flexural modulus i 373-000 334, 000 208, 000 Percent decrease in flexural Percent decrease of flexural modulus o ver base resin 10. 5 20 modulus over base resin 10.5 20 Heat distortion temp. F., Heat distortion temp, F.,

264 .s,i. 341 336 33 .264 p.s,i.) 341 I 330 333 Rockwell hardness 122 11 Rockwell hardness 122 112 l Represents the styrene-acrylonitrile on ethylene-propylene terpolymer spine described above. 7 I i 1 7 EXAMPLE 7 a This example, illustrates the degree of improvement in impact strength achieved by incorporating into polysulfone resin (coded P-l700 and 'sold by UnionCarbide Co.) various levels of a graft copolyrri'efconsisting of 35% styrene, 15% acrylonitrile and 50% ethylene-'pro .iRepresents the styrene-acrylonitrile on ethylene-propylene spine described above.

EXAMPLE 9 This example illustrates the degree of improvement in impact strength achieved by incorporating into ,PQIysulfone resin (code P1700 and sold by Union Carbide Qo.) various levels of a graft copolymer consisting of 21% styrene, 9% acrylonitrile and ethylenepropylene S ethylidene-Z-norbomene terpolyrner spine, said percentages being based on the total weight of graft copolymer. g V

The terpolyrner spine has a propylene content of 37% based upon the total Weightpf the terpolyrner and an iodine number of 9. I

The graft copolymer used herein was prepared ac- 10 The graft copolymer used herein was prepared accord ing to the method described in copending application Ser.- No. 787,984, filed Dec. 20, 1968.

The graft copolymer was blended into the polysulfone fone resin at 480 F. on a differential roll mill, calendered resin at 80 011 a differential T011 mill, calenderd at at 450 F. and subsequently molded into plaques using 450 F. and subsequently molded into plaques using the the method described in Example 1. method described in Example 1.

The data set forth in Table 9 is a comparison of the The data set forth in Table 11 is a comparison of the unmodified polysulfone resin with the polysulfone resin unmodified polysulfone resin With the polysulfone resin blended with the graft copolymer described in this exblended with the graft copolymer described in this example. ample.

TABLE 9--C0MPARIS0N 0F RESIN AND POLYBLEND TABLE 11.COMPARISON OF RESIN AND POLYBLEND PROPERTIES PROPERTIES 95 90 polysulfonz polysulfon? polysulf 100% 5% S/AN 10% S/AN 10 s/MMA' polysulfone on EDPM on EDPM po1ysumme on EPDMI antraassets .8 w Perce'ntmcreaseln impact Percent dares'raooefiimt'aear strength over base resin. 1 2 7 bas resin l 287 Flexural modulus 373,000 297. 7 Fl xural mo dfil $711,000 3021000 Pgfifiltlzlggcgsgse b12:1S ilegggal r 2 27 4 Pebrcent dfifrease of flexural modulus over 9 ase res 1152.2 gigtioation temp. F., 341 333 328 geatgsvisltlolrltiol temp. F., 264 p.s.i. Rockwell llidlis's'fffjlll .I 120 110 6 mess l pas y lgggg a egl gigtrfle on ethylene propylene terpolymer g ig gig ggfiggg g gggggg gggg w on ethylene EXAMPLE 10 EXAMPLE 12 This example illustrates the degree of improvement in This example illus,trates the degree imlirovement in impact Strength achieved by incorporating into p013 lmpact strength achieved by mcorporatmg lnto polysulsulfone resin (coded P-1700 and sold by Union Carbide (mded P4700 and by COJ various levels of a graft copolymer consisting of Co.) vanous levels of a graft copolymer consistmg of 50% styrene, and 50% ethylene-propylene-S-ethylidene- -50% ,methy1. methacrylate and 50% ethYIeHC-PFOPYIeHe-S- Lnorbomene terpolymer spine, Said Percentages being ethyhdene-Z-norbornene terpolymer spine, said percentbas'ed on the total Weight of graft copolymer ages being based on the total weight of graft co-polymer.

The terpolymer spine has a propylene content of 37%, 35. The terpolymer spine has a propylene content of 37%, based upon the total weight of the terpolymer and an P i upon the total Welght of the terpolymer and an iodine numberlqf I 1od1ne number 9.

The graft copolymer used herein was prepared accord- The graft cooplymer .used.herem prepa.red.accrd' ing to themethd described in copendmg application Sen mg to the method described In copendmg applicatlon Ser. No. 787,984, filed Dec. 30, 1968. 40 No. 787,984, filed Dec. 30, 1

The graft copolymer was blended into the polysulfone T graft ocopolymer w blnded the polysulfone resin at 480 F. on a differential roll mill, calendered at at 480 on a dlfiemntlal 9 calendfred at 450 and subsequently molded into plaques using the 450 and .subsaiquenfly molded mto plaques usmg the method described in Example 1. fi g E fF The data set forth in Table 10 is a comparison of the ata set on m 2 18 a comparison of h unmodified polysulfone resin with the polysulfone resin unmodlfied. polysulfone resm with the pplysuifone.resln blended with the graft copolymer described in this blended with the graft copolymer described in this exexample. ample TABLE 10.-COMPARISON 0F RESIN AND POLYBLEND TABLE 12=o0MPARIs0N 0F RESIN AND POLYBLEND PROPERTIES PROPERTIES 90 90 polysulfon i polysulfou? 100% 10% s on 100% 10% S/MMA polysulfone EPDM 1 polysulfone on EPDM Ml??? Izod impact strength (ft.-lbs./in.) 0 8 9 0 Mllgzch Izod impact strength (it;.lbs./in.) 0 8 2 9 Ptgqenl; i' rfo'r'oa'se'i d'ifiipot tifigthi? i 1 Percent Edna 151E555; "steam ma; 262'5 S {GS 11 3S8 res 11 Fleir ral modulus 373, 000 302, 000 Flexural modulus; 373, 000 310, 000 Ptgeentdieerease in flexural modulus over 19 Percent dlilerease in flexural modulus over 15 e BS8 I'GS fie t iiistfoi tion temp. F., 264 p.s.l.) 341 334 Heat distortion temp. F 264 341 332 Rockwell hardness 114 Rockwell hardness i 119 1 The styrene on ethylene-propylene terpolymer spine described above. 1 The graft copolymer of methyl methacrylate on ethylenepropylene terpolymer spine described above.

EXAMPLE 11 This example illustrates the degree of improvement in 05 EXAMPLE 13 impact strength achieved by incorporating into poly- This example illustrates the degree of impact improvesulfone resin (coded P-1700 and sold by Union Carbide ment achieved by blending the graft copolymer of (28/ Co.) various levels of a graft copolymer consisting of 12) styrene/acrylonitrile of an ethylene propylene-5- 29.5% styrene, 29.4% methyl methacrylate and 42.1% ethylidene-Z-norbornene terpolymer spine as described in ethylene-propylene-5-ethylidene-Z-norbornene terpolymer Example 8 with polysulfone at the 20% graft level. The spine, said percentages being based on the total weight of graft polymer was blended into the polysulfone at 425 graft copolymer. F. on a differential roll mill for 38 minutes and then The terpolymer spine has a propylene content of 37%, calendered at 430 F. based upon the total weight of the terpolymer and an This example also illustrates the unique character of iodine number of 9. the impact improvement achieved using a graft polymer '1 1 since a similar improvement in impact strength is not obtained with a styre'ne/acrylonitrile resin preblended With an ethylene/ propylene terpolymer. I t This preblendedwas incorporated into polysulfone at the level on a difierential mill at 440 F; and subsequently calendered at 450 F.

TABLE13.COMPARISON OF RESIN AND POLYBLEND The mixtures of this inventionmay contain certain other additives to plasticize, extend, lubricate, prevent oxidation of the mixtures, and can. also include-flammability retarding agents, dyes, pigments, etc. Such/additives are well known in the art and may be incorporated without departing from the scope of the invention.

The following ASTM tests were used to determine the t data disclosed in the examples: ,notched izod impact (D-256-56 Method A); fiexural strength and modulus (D-.63864T); heat distortion at 264 p.s.i. fiber stres (D-'-648-56'); Rockwell hardness (D-785-65).

Having thus described our invention, what I claim and desire to protect by Letters Patent is:

1. A synthetic thermoplastic resin composition comprising a blend of 1 (A) from about 75% to 99% based on total weight of composition of a linear thermoplastic polyarylene polyether polysulfone resin and is composed of recurring units having the formula: 1

I I t l l l r, i K 93 wherein R represents a member of the group consisting of a bond between aromatic carbon atoms and a'divalent connecting radical and R represents sulfone,

Y and Y each represent inert substituent' groups selected from the group consisting of halogemalkyl groups having from 1 to 4 carbon atoms and alkoxy groups having from 1 to 4 carbon atoms and where r and z are integers having a value from 0 to 4 inclusive, and I 12 "(B) correspondingly from about 1% to 25% based 'ontotal weight of composition of (i) an ethylene-propylene-non' conjugated I diene I terpolymer, or I I (ii) an ethylene-propylene non-coniugated diene terpolyrner spine grafted with styrene, styreneacrylonitrile, methyl methacrylate, or styrene- I methyl methacrylate'; I i t i 2. The composition "as'in claim 1 wherein (A) is composed of between about and 95% by weight' of recurring units of the formula:

0H, "'o L @-a@O/ t -l a a t l 3. The composition of cla'imfz in which (B) is ethylenepropylene-dicyclopentadiene terpolymer; II

'4. The composition'of claim 2 in which (B) 'islian ethylene-propylene-l,4hexadiene terpolymer. I

' 5." The composition of claim 2 inwhich,.'(B') is'an ethylene-propylene-5-ethylidene-2-norbornene' terpolymer. 6. The composition of claim 2 in which (B) isa giaft polymer of styrene-acrylonitrile on an ethylene-propylene- .;ethylidene-2-norbornene spine, v

7. The composition of claim 2 in which (B) is a graft polymer of styrene-methyl methacrylate on an ethylenepropylene-S-ethylidene-Z-norbornne spine.

8:"The composition of claim 2in'which'(B) is a graft polymer of methyl methacrylate on an ethylene-propylene- 5 ethylidene-2norbornene spine. I

' 9. The composition of claim 2 in which (B) is ethylenepropylene-1,4-cyclooctadiene.

' 10. The composition of claim 2 in which (B) is a graft polymer of styrene on an ethylene-propylene 5-ethylidene- 2 -norbornene spine.

References Cited I UNITED STATES- PATENTS II 5,510,415 Barth zen-.49, 1X

5/ 1970 3,489,821 1/1970 Witt et a1. 260"- 876 3,472,810 10/ 1969 Gowan -260897. X 3 ,405,199 10/1968 Snedeker 260 897 X Barth 204--l59.2

MURRAY TILLMAN, Primary Examiner H. W. ROBERTS, Assistant Examiner US. Cl. X.R. 

